Crash on "power off" with 2.4.22-SMP

Hi,

I am running 2.4.22-SMP with devfs and 1 GB RAM. I enable ACPI with acpi=force. As of 2.4.22, my kernel has started oopsing when I try to power off on shutdown. This appears to be due to a deadlock which the NMI watchdog breaks. The full oops is attached,

Cheers,
Chris

ksymoops 2.4.9 on i686 2.4.22. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.22/ (default)
-m /boot/System.map-2.4.22 (specified)

NMI Watchdog detected LOCKUP on CPU0, eip c019a63f, registers:

CPU:    0
EIP:    0010:[<c019a63f>]    Not tainted

Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00000046
eax: 00000001 ebx: 00000400 ecx: f77cde24 edx: 00000400
esi: 00000010 edi: 00000400 ebp: bffffd58 esp: f77cdde0
ds: 0018 es: 0018 ss: 0018
Process poweroff (pid: 397, stackpage=f77cd000)

Stack: 00000001 f77cde24 c01a5d7e 00000400 f77cde24 00000010 00002001 00002001
       00002001 c0299c38 00000000 c01a5ab7 00000010 f77cde24 c1d730f4 00299c60
       00000000 00000000 00002001 c01a58d6 00000000 00000001 f77cde3c 00000000
Call Trace:    [<c01a5d7e>] [<c01a5ab7>] [<c01a58d6>] [<c01a609c>] [<c01b4461>]
  [<c01b44bc>] [<c01b433b>] [<c01073f2>] [<c012bfaa>] [<c011ca96>] [<c0129fce>]
  [<c012a366>] [<c012ac94>] [<c011b592>] [<c011b510>] [<c0129073>] [<c010942f>]
Code: 66 89 01 eb dc 8b 4c 24 0c 8b 54 24 04 8b 44 24 08 83 f9 10

Trace; c01a5d7e <acpi_hw_low_level_read+9a/9f>
Trace; c01a5ab7 <acpi_hw_register_read+51/15d>
Trace; c01a58d6 <acpi_get_register+46/7b>
Trace; c01a609c <acpi_enter_sleep_state+195/1ae>
Trace; c01b4461 <acpi_system_suspend+2d/40>
Trace; c01b44bc <acpi_suspend+48/9f>
Trace; c01b433b <acpi_power_off+7/9>
Trace; c01073f2 <machine_power_off+12/20>
Trace; c012bfaa <sys_reboot+27a/2a0>
Trace; c011ca96 <wake_up_process+16/20>
Trace; c0129fce <deliver_signal+9e/a0>
Trace; c012a366 <kill_something_info+d6/1c0>
Trace; c012ac94 <sys_kill+54/60>
Trace; c011b592 <schedule_timeout+62/b0>
Trace; c011b510 <process_timeout+0/20>
Trace; c0129073 <sys_nanosleep+d3/170>
Trace; c010942f <system_call+33/38>

Code; c019a63f <acpi_os_read_port+49/4e>
00000000 <_EIP>:
Code; c019a63f <acpi_os_read_port+49/4e> <=====
0: 66 89 01 mov %ax,(%ecx) <=====
Code; c019a642 <acpi_os_read_port+4c/4e>
3: eb dc jmp ffffffe1 <_EIP+0xffffffe1>
Code; c019a644 <acpi_os_write_port+0/41>
5: 8b 4c 24 0c mov 0xc(%esp,1),%ecx
Code; c019a648 <acpi_os_write_port+4/41>
9: 8b 54 24 04 mov 0x4(%esp,1),%edx
Code; c019a64c <acpi_os_write_port+8/41>
d: 8b 44 24 08 mov 0x8(%esp,1),%eax
Code; c019a650 <acpi_os_write_port+c/41>
11: 83 f9 10 cmp $0x10,%ecx

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